Automatic potential-regulator for dynamos.



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J. J MUELLER, Jn. AUTOMATIC POTENTIAL. REGULATOR FOB DYNAMOS.APPLICATION FILED MAY 21 1909 w th auroivr'nlifiidrotrEnrIAL-nneunnironr012, nYNAMo eca'seel v Specification of Letters Patent. Patefited,Application filed May 21, 1909. semn No. 497,487." I

MUELLER, In, oFI'E RU, ILLINOIS.

To all whom it may concern:

Be it known that I, JOHN J. MUELLER, J r., of the city of Peru, in thecounty of Lasalle and State of Illinois, have invented a certain new anduseful Improvement in Automatic Potential-Regulators for Dyna-mos, ofwhich the following is a specification.

The object of my invention is to provide a regulator for a dynamoelectric machine which will automatically regulate the potential orvoltage on the supply wires, so

that an even and constant voltage will always be maintained on saidsupply wires, notwithstanding the varyingamount of current taken fromsaid lines, or the abnormal increase of speed of the'dynamo'electricmachine'or generatoras it a'lled- Further; my 'invent ionj consists insuch novel constructions as will be described and set forth in theclaims.

In the drawings, Figure 1 is a view showing my regulator connected to adynamo. Fig. 2, is a side view of my regulator showing a part in sectionalong a line A. B.

of Fig. 1.

Similar numerals represent the same parts throughout the drawings.

' i In the drawings, 1 is a dynamo or electric generating machine, 2 isthe field winding on same, 3 is its armature having a commutator onwhich the brushes 4 and 5,.which collect the current from them, bear.Brush A, is connected to the wire 6 which forms one side of theline anda. brush 5 is connected to tact with each other.

' i of each the resilient members a wire 7 which forms the other side ofthe line. Connected across the lines 6 and 7 by.

means of wires 8 and 9, is an electromagnet 26 which hasaring-shapedjcore 10, which is parted at 11 and 'fa'stenedji'to a base,not shown in thedrawings, byiheans of a foot 27 projecting froin'coreflOi Fastened to this-core 10, on either sideof the slot 11, areresilient members 12 and "13. which are notchedat 14 so that they cancross each other, as shown, without coming into con- These resilientmembers 12 and 13'a re insulated from this iron core 10, so as toprevent the electric current from shuntin'g from one to the otherthrough" saidfcofre 10. Threaded; into, the upper ends 'i-equired onthe-line.

a thumb screw 16 whichjcarries a lock nut 17, the ends of the members 12and 13 being reinforced by means 'o'it'j'a nut 15 which, is fastened tosame. Into the ends of each of the thumb screws 16 is inserted aplatinum point 18 which points remain in contact when the voltage isnormal. Adjacent to the contact surfaces of these platinum points 18 arethe conical poles 19 of an electromagnet 20, which has its windingconfined by the insulated washers 25 on same. The field winding 2 ofgenerator 1 is connected to wire '7 (one side of the line) and to theother side of the line 6, through the resilient members 12 and 13, abovementioned. Shunted across these resilient members-1'12 and 13, by meansof wires 22 and 23 is the electromagnet 20 above mentioned, ,so that ifthe contact points 18 of the resilient members 12 and 13 be separated,the current willfiow around through. this electromagnet, setting up astrong magnetic field across the gap between the pole pieces 19 whichwill blow the are which forms at the break when points 18 are separated,and which melt-s away these points 18, causing them to stick,

which makes the device ino :rative. This has been the trouble with theregulators in use before my invention. I find that in my regulator thisdoes not occur. I' further find, that no matter how great is thevariationiof the load 28 acrossthe line, the vol tage will remainconstant.

In practice the operation of myv device is as follows :The speed of thegenerator is raised abnormally above that required for a given voltage,or-which is practically the same thing, the generator can be: wound togive a voltage considerably higher than that The tendency will be,

as'soonas the generator is started, in either case to ive an abnormallyhigh voltage, which being impressed across the coil of the electromagnet26 will cause the ends of ring 10 to close the slotll', which in turn.will separate the-contact points 18 of the resilient shunts the entirefield current through the coil ofthe electromagnet 20 setting up astrong magnetic field around the gap a'd-.

jacentto s'aiel cont'act points which prevents -members 12' and 13 whichimmediately the number of contacts made are so propontioned to the timeelement of the electromag the usual are or spark across said contactpoints as the. circuit is opened. Opening the field circuitat the points18 as-abovc mentioned, reduces the field current, which in turn reducesthe magnetic field of the generator, which again drops the voltage anddecreases the magnetic attraction at the slot 1.1 and again permits thecontact points 18 of resilient members 12 and'13 to come into contact,when the Volta e ,will again rise, and the above result willbeirepeated, until net 20 that it permits the required average fieldcurrent to pass through it to roduce the constant voltage required onthe line, and it will do this for any speed above that required toproduce the necessary voltage. It is evident that the ,devices usedbefore'my invention which use non-inductive resistances cannotaccomplish this result, since the resistance is constant, which when thespeed variation is great, is necessarily great, and consequently thevariation of the field current is great'the efiect of which controls thevariation of the voltage produced. With a variable resistance itrequires the constant attention of the operator which defeats thepurpose of the regulator. ,With my invention all the non-inductiveresistance is kept out of the field circuit, and the magnetism inducedby the current is used to protect the platinum contact points frommelting and sticking together. i

I claim:

1. An automatic potential regulator for dynamos, comprising anelectromagnet' con nected across the main current lines, a core in saidelectromagnet, a resistance in the field circuit,-contact points on thecore of said magnet and insulated therefrom, co-

operating with said electromagnet for opening and closing a shunt aroundsaid rcsistance, said resistance coin )rising an electromagnet connectedaroun said points,.and pole pieces on said electroinagnet adjacent tosaid contact points.

-- 2. An automatic potential regulator for dynamos, comprising anelectromagnet connected across the main current lines, a core in saidelectromagnet, a resistance in the field circuit, contact points on thecore of said magnet and insulated therefrom, cooperating with saidelectromagnet for opening and closing a shunt around said resistance,said resistance comprising an electromagnet connected across saidcontact points, and conical'pole pieces on said magnet adjacent to saidcontact points, substantially as shown and described. i

3. In an automatic potential regulator for dynamos, an electromagnetacross the main current lines, a core in said electromagnet Circular inform with its poles adjacent, a

member mounted on each of said pole pieces, an adjustable contact pointon each or" said members, saidpoints being normally in con tact, anelectroinagnet shunted around said points coiiperating therewith toregulate the quantity of the current in the field of said dynamo.

4. In an automatic potential regulator for dynainosganelectromagnet,across the main current lines, a core in saidelectromagnet circular in form with its poles adjacent, a membermountedon each ot said pole pieces,

"an adjustable contact point on each of said members, said points beingnormally in contact, an electromagnet shunted around said points, thepole pieces of sa id electromagnet terminating adjacent to said contactpoints,

substantially as shown and for the purpose set forth. I T.

5. An apparatus for producing a constant voltage with a variable speed,comprising a dynamo wound for an, abnormally high voltage, anelectromagnet clectrica ly connected across the supply wires from saiddynamo, a core in said electromagnet circular in form with its polesadjacent, a member mounted on each of said poles, an adjustable contactpoint on each of said men'ibers,,an electroinagnet shunted aroundsaidpoints, cotiperating therewith to regulate the quantity of thecurrent passing throu lithe field of said dynamo.

- 6. i n apparatus for producing a constant voltage with a variablespeed,eomprising a dynamowound for an abnormally high voltage, anelectromagnet electrically connected across the supply wires from saiddynamo, a core in said electromagnet cir cular in form with its polepieces adjacent, a member mounted on each of said pole pieces, anadjustable contact point on each of saidincmbers, an electromagnetshunted around said. points, the pole pieces of said electroinagnetterminating adjacentto said contact points. v

7. An apparatus for producing a constant voltage, comprising a dynamonormally wound for a given voltage and driven at an abnormal speed, anelectromagnet electrically connected across the supply wires from saiddynamo, a core in said electroins magnet circular in form with its polepieces ad acent, a member mounted on each of said pole pieces, anadjustable contact point on each of said members, an electromagnetshunted around said points, and cooperab i'ng therewith to regulate thequantity of the current passing through the field of said dynamo.

8. An apparatus for producing a constant 'electromotive-force, comprisng a dynamo normally wound and driven at. an abnor-. mally high speed,an electromagnet electrically connected across the supply wires frommounted on each ofsai ole pices and insulated therefrom an amfiustablecontact 1 l N point 0n each of sand members, an electro- Witnesses: I111a "net shunted around said *points and \Vmmmu A. ]{.,\n'.rm-:,

said dynamo, a core in said electromagriet terminating adjacent to saidcontact points, with .lts pole places adacent, a member substantmlly asshown and dOHCllbBd. I

c'bmcnl pole pieces on said electromagnct PAUL Bmums.

